N = int(input())

edges = [0] * N
for _ in range(N - 1):
    u, v = map(int, input().split())
    edges[u] += 1
    edges[v] += 1

t = sum(1 for e in edges if e == 0)
if sum(1 for e in edges if e == 1) !=0:
    t += 1

if t >= 2:
    print('Alice')
else:
    print('Bob')